Great points above. Also keep in mind that localization is not only text.

1. What's a positive symbol in one country is something negative in another (i.e. thumbs up)
2. Think about your colors, white means peace in the U.S. and other things in another country.
3. Also, localize your images. You don't want to offend because you added images that are completely harmless in your country and something vile in another (i.e. the infamous World of Warcraft China mishap)